package com.xxxx.server.config.security.component;

import org.springframework.security.access.AccessDecisionManager;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.access.ConfigAttribute;
import org.springframework.security.authentication.AnonymousAuthenticationToken;
import org.springframework.security.authentication.InsufficientAuthenticationException;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import java.util.Collection;

/**
 *权限控制
 * 判断用户角色
 * */
@Component
public class CustomUrlDecisionManager implements AccessDecisionManager {

    @Override
    public void decide(Authentication authentication, Object o, Collection<ConfigAttribute> collection) throws AccessDeniedException, InsufficientAuthenticationException {
        for (ConfigAttribute configAttribute : collection) {
            //当前url所需角色
           String needRole= configAttribute.getAttribute();
           //判断角色是否登录即可访问的角色，此角色在CustomFilter中设置
            if("ROLE_LOGIN".equals(needRole)){
                if(authentication instanceof AnonymousAuthenticationToken){
                    throw new AccessDeniedException("尚未登录，请登录！");
                }
                else{
                    return;
                }
            }
            //判断用户角色是否为url所需角色
           Collection<? extends GrantedAuthority> authorities=authentication.getAuthorities();
            for(GrantedAuthority authority:authorities){
                if(authority.getAuthority().equals(needRole)){
                    return;
                }
            }
        }
        throw new AccessDeniedException("权限不足，请联系管理员！");
    }

    @Override
    public boolean supports(ConfigAttribute configAttribute) {
        return false;
    }

    @Override
    public boolean supports(Class<?> aClass) {
        return false;
    }
}
